Just to add a little to what PamOKW has already said:
The 2002 points would be those added to the account on 12/1/2002. You would have until May 31, 2003 to bank 100% of them into the 2003 use year.
If you were talking about the points that went into the account on 12/1/2001 (These would be the 2001 use year points), you would have until May 31, 2002 to bank 100% of those points into the 2002 use year.
If you do not bank or borrow, the 2001 points are good for stays between 12/1/2001 and 11/30/2002.
If you do not bank or borrow, the 2002 points are good for stays between 12/1/2002 and 11/30/2003.